Could be just getting bored at high levels,or he just likes remorting and trying out different upgrades. I always said I think you have more fun at lower levels when your equipment and the creatures are not that tough!

I figure that by level 21 or level 22 you should have all the immortal skills maxed out. Are there any other advantages to remorting that many times?

Myself, I'd like to get close to having it all done with one character. My immortal (Thorn Lowe) is getting there...but I figure he has all his skills (immortal and otherwise) done by level 250 except the Immortal Vengence (rank 9).